Communication system



July 11, 1939. R, DOTY- 2,165,237

COMMUNICATION SYSTEM Filed Dec 23, 1936. 2 Sheets-Sheet 1 a; Flt-3.3.-

9 i? 12 9 Q 12 1 I 21 ea 1&

" lNVENTOR 20 Mfi? ATTORNEY July 11, 1939. c. R DOTY COMMUNICATIONSYSTEM Filed Dec. 23, 1 956 2 SheGts-Shqet 2 FIGA.

TINVENTOR AfToRNEY Patented .Iuly 11', 1939 UNITED STATES COMMUNICATIONSYSTEM Charles R. Doty, Binghamton; N. Y., assignor to InternationalBusiness Machines Corporation, New York, N. Y., a corporation of NewYork Application December 23, 1936, Serial No. 117,269 I 9 Claims-1 (01.178-79) of the character signals- An object of the present invention isto provide signal storing means which are operated alternately by thecharacter keys so that one group of said'storing means may be energizedduring the timed interval the othergroup of storing means is effectiveto impart the stored signal to the transmission line.

Various other objects and advantages of the invention will be obviousfrom the following par-v lli ticular description of one form ofmechanism embodying the invention or from an inspection of theaccompanying drawings; and the invention also constitutes certain'newand useful features of construction and combination of parts hereinafterset forth and claimed.

In the drawings: V i

Fig. 1 is a fragmentary sectional view of one type of tele-typewriter.

Fig. 2 is a detail view of .a controlling clutch.

Fig. 3 is a schematic circuit diagram embody ing one form of theinvention.

Fig. 4 is a modified circuit diagram embodying another form of theinvention.

Referring to the drawings, and in particular to Fig. 1, one type oftele-typewriter is shown and in the embodiment illustrated in thedrawings, well known means are provided for actuating the type bars (notshown) by power operated devices comprising a power driven'roller l0.

A cam" I l is pivoted on one arm of a bell crank lever l2 pivoted in theframe, the other arm of which is operatively connected with one arm of a'belP crankiever l3 by means of link I4. The other arm of lever I3 isconnected to the type bars (not shown) in a well known manner and 1fully disclosed'in the aforesaid application.

The lever I2 is actuated by the cam II when the latter engages thedriven roller I 0 to be operated thereby. The engagement of the cam llwith'the power roller is controlled by means of pressed arm 20 whichtends to turn it into engagement with the power driven roller or stop Hon' a lever 22 pivoted on the bell crank l2 and normally arranged in thepath of a lug 23 on the cam. When the, lever 22 swings to move its stopout of the path of the lug, the arm 20 swings 5 the cam into engagementwith the power roller to be actuated thereby to wine the bell crank I:to actuate its connected mechanism.

The lever 22 has anarm 24 which is providedwith an offset projection 25at its end which projects laterally through an opening in the bell crankl2 and engages the bifurcated lower end 26 of an arm 21 of a key leverI'I pivoted on the common rod 28.

It is obvious then that depression of a key lever l'l releases therevolubly mounted cam .H to engage and be actuated by power roller It]in turn operating bell crank 12 and its attached links to cause theassociated mechanism, such as the key bars and other operatingmechanisms, to be operated.

In addition to actuating the several type bars and connected mechanisms,the revolubly mounted cams are adapted to make and break circuits whichmay be employed in the transmitting units by operating the associatedgroup of contacts indicated at 30, the purpose of which will beunderstood as the description progresses.

It will be understood that the usual number of key bars and powerdevices with their associated mechanisms are provided, but only one ofthem is shown for the sake of clearness.

Referring now to Fig. 3, the operation of the impulse storage devicewill nowbe explained. A rotary distributor 3| is shown and provided witha plurality of conducting segments 32 which are traversed by acontinuously rotated brush 83, and

a common conducting ring 34 which is connected to one side of thetransmission line. A similar rotary distributor is provided at thereceiving estareceiving circuit forms no part of the invention,

and thesystem as a whole based on the Baudot type of system which iswell known in the art,

it is believed that further description thereof is not necessary in thepresent instance. The combinational code signal impulses are initiatedby the various cam operated group of contacts 30, 3ll--a, etc. Anadditional pair of contacts is provided in each said group of contacts,for example,

, contacts 30-l and 30-2. Let it be-assumed that a corresponding key barI! is depressed to oper-'. ate the said group of contacts 30l toG'momentarily.

A circuit is then established through the oper ated contact 30-4 fromthe positive terminal of battery 35, contacts 3lli, conductors 36 and31, magnet coil 38, conductor 39 to the negative terthe'high portionofthe cam wheel tomalntaincontacts 41 closed and contacts, open.Energi-z zation and deenergization again of the said coil is theneffective to position the cam wheel 50 that the follower arm 46 rests onthe low portion of the cam wheel to close contacts 48 and open contacts4I. A plurality of'contacts is provided to be operated by the said camwheel and are shown as indicated by the reference, characters 41-1 to 8and 48-4 to l I Continuing now-with the assumed example, the

circuit established through contact M4 was just traced and describedtoenergize the magnet coil 3B, but ineifective at the present moment tooperate the associated contacts 41 and 48. A circuit through contact -2is also established from relays 12-2, 12-3 and l3-5 are enermzed andholding circuits established therefor through contacts 14-2, 14-3 and14-5 and the conducting segment of conducting ring 53. Energizatlon ofthe said relays in addition to operating the said contact I4, alsooperates thecontacts IT-l,

11-2, II-3, and II-5.

I It'was mentioned that the distributor 33 and gear 58 are rotatedcontinuously, and that upon energization of the magnet H the dog 55(Fig. 2) is released; however, the shaft 52 is not brushes rotated untila predetermined point in the disi the positive terminal of battery 35.to conductor 49, contact 48-6, conductor 50, clutch magnet 5!, commonreturn conductor 39 to battery 35, energizing-the said clutch magnet 5!,thereby effecting rotation of shaft 52 and the conducting rings 53 to58, secured thereto.- Any well known magnet is deenerg'ized, the stop 5|ispositioned coupling means may be employed torotate the shaft 52, oneform thereof', shown in Fig. 2, comprising .an armature 59 associatedwith the magnet 5l,said armature provided with an extension arm and stop6|, so that when the .in the ,path of the fingers 62 and 53 whichprotrude from the dog supporting member 54 and I dog respectively Thesaid member 54 is secured to the .shaft52 and pivotally supports thedog65. A single tooth driving gear 66 is rotatably mounted on the shaft52 and has secured thereto agear 61 adapted to engage the gear 63'mounted .on shaft 69., The shaft 59 which drives'the gear 56continuously may be thesame shaft supporting and driving thetransmitting distributor brushm 33. It is seen from the description justset forth that upon-"energization of magnet 5|, the pivoted armature 53is attracted and rotated partially in'a counterclockwise direction so asto release-the said fingers 62 and 63 permitting the spring-actuated dog65 to engage thegear 55 and the single tooth therein when advanced tothe dog thereby rotgtiszg the shaft 52 and the conducting rings 53Continuing with the assumed example, another circuit is establishedthrough contact 30-3 from the battery 35-.to conductor I0, contact43-l,- conductor'll, coil of relay 'I2-l and common conductor I3 to thesaid battery energizing said relay. Through the associated contact'I4-l', now closed, a holding circuit is established from battery 35,conductor I5, conducting segment 53,-l

of rlng'5 3, conductor", contact 14-], coil of relay 12-] and conductorI3 to battery 35 mainlatedsegment 53-2 engages the associated tributorbrush cycle is approached; that is, before the brush 33 completelytraverses the segment 32-6, the single toothof gear is advanced so thatthe released dog can engage the tooth to rotate the shaft 52 andconducting rings 53 to. It is to be noted that the brushes associatedwith conducting rings 54 to 58 normallyengage the insulated segments ofthe said rings and not until the rings are rotated. are the conductingportions of the rings engaged. Asthe distributor brush 33 engages thesegment 32-I, the brushes associated with rings 54 to 58 engagetheconducting segments thereof so that the character signal impulses aretransmitted to the line inaccordance with the operated relays 12-! to 5,

namely, in the assumed example, relays II-l, IE-2', IZ-4 and 12-5 areenergized, operating the contacts I'I-l, II-2, IT-3, and ll-5,permitting signal impulses to be imparted to the line as the distributorbrush traverses segments 32-l 32-2, 32-3 and 32-5. Immediately after thebrush 33 traversed the segment 32-5, the insulated segment 53-2 of ring'53 engages the associated brushes to open the described holding andimmediately thereafter the insulating segments of the rings 54 to 58engage the associated brushes. Also at this same time, the dog 65 isreleased fromthe driving gear 64 due to the positioned armature 59 whichas mentioned is in the path of the tails or fingers 62 and 63 to efiectdisengagement of the clutch in a mannerwell known. 1

The said cam actuated contacts 35 are closed for a short timed interval,therefore, immediately after the cam completed its half revolution, themagnet 33 is deenergized to step ahead thecam wheel 43 to operatethe'contacts 41 and 48. Concircuits for relays 12-1, 12-2, 72-3 and12-5,

tinuing with the assumed example, upon deenergization of the magnetcontacts 4] would now be closed and contacts 48 opened. It is seentherefore that the contacts 30 are now connected to contacts- 4l-l to 5and upon depression, let us say, of the same key'bar to operatecontacts- 3ll-I. to 5, relays 80-2, 33-3 and 35-5 are operated, inaddition to the energizationof magnet 38 and clutch magnet 8|. Operationof clutch magnet BI is effective to start rotation of the shaft 88 andthe conducting rings 82 to 81 in'exactly the same manner as justdescribed,- I

said shaft and rings operated in the same timed relation with thedistributor brushes 33, so that the relays Ill-l 30-2, 80-3 and 33-5 aremaintained to store the combinational character impulses and laterimparted to the line as the disbrushes 15a connected to. conductors I5and I3 to break the said holding clrcuit.

' Similarly, through the contacts 35-4, 33-5,

" and30-3 and contacts 43-2, and 43-5,

tributor brush 33 traverses the segments 32.

The relays I2 and 30 are energized in oombisignals to the line,the'other group of relays canbe energized to set up" the character to bestored, thus effecting a faster rate of transmission of the charactersignals.

Referring now to Fig. 4, an impulse storage system similar in principleto the one just described is shown; however, the groups of condensers 90and 9! are used in place of the group of relays l2 and 80 shown in Fig.3. The principle of operation is exactly the same as set forthhereinabove so that the following brief description of operation isbelieved to be sufficient. Let it be assumed that the character key barto operate the group of cam controlled contacts 30l to 0 is depressed. Acircuit through contact 30-4 is then established to energize the magnet30, the

group of transfer contacts 41 and 43 are not op-' erated at this moment,but only upon deenergization of the magnet. Through contact 30-2 acircuit is established to energize the clutch magnet 5l to effectrotation of the shaft 52 and conducting rings 53 to 58. Through contact30--3 a circuit is established to charge condenser 90-1. The holdingcircuits described hereinbefore are dispensed with; therefore, it is tobe noted that conducting ring 53 is normally positioned so that .theinsulating segment engages the associated brushes and is effective onlyto provide a discharge path for the group of condensers. Similarly,condensers. '90-2, -3 and 30-5 are charged. Upon opening of the contacts30-4 to 8, the transfer contacts 01 and 43 are operated and clutchmagnet'5i is deenergized to position the associated armature stop in thepath of the clutch dog. The said -clutch engaged as the brush 33traversed the latter section of segment 32B effecting rotation of therings 53 to 58 to provide discharge paths for the individual condenserscharged so that upon traversing the individual distributor segments 32,the brush 33 completes the individual discharge paths to energize theoutput transformer 96 and thereby imparting the combinational impulsesto the transmission line. Upon depression of the said key again thegroup of condensers 3| are charged :in a

similar manner to be discharged at a later interval as the distributorbrush completes the individual discharge paths to impart the storedsignals to the said transmission line.

While there has been shown and described and pointed out the fundamentalnovel features of the invention as applied to a single modification,

it will be understood that various omissions and substitutions andchanges in the form and details of the device illustrated and in itsoperation may be made by those skilled in the art without departing fromthe spirit of the invention. It is the intention therefore to be limitedonly as indicated by the scope of the following claims.

What is claimed is as follows:

1. A communication system of the character described comprising, incombination, means to initiate character signal impulses, distributormeans to impart character signals to a transmission line, groups ofimpulse storing means, and means controlled by the initiating means toconnect alternately the groups of the storing means with the saidinitiating means and distributor-means.

2. A communication system of the character described comprising, incombination, means to initiate character signal impulses, distributormeans to impart signals to a transmission line, a predetermined numberof circuits associated with said distributor means, groups of signalstoring means, and means controlled by the initiating means to connectsaid storing means alternately with the said predetermined number ofcircuits to effect transmission of the character signals initiated.

3. A communication system of the character described comprising, incombination, means to initiate character signal impulses, distributormeans to impart signals to a transmission line,

groups of signal storing means, and circuit controlling means connectingthe said storing means and distributor means, said circuit closing meanscontrolled by the initiating means effecting trans- .mission of thecharacter signals initiated.

4. A communication scystem of the character described comprising, incombination, means to initiate character signal impulses, distributormeans to impart signals to a transmission line,

"groups of signalstoring means, and circuit controlling means controlledby the said initiating -means and operated in a predetermined timedrelation with respect to said distributor means to connect the saidstoring means and distributor means effecting transmission of theinitiated character signals.

5. .A communication system of the character described comprising, incombination, means to initiate character signal impulses, .distributormeans to impart signals to atransmission line,

groups of signal storing means, circuit controlling means controlled bythe initiating means connecting the said storing means and distributormeans, and means to connect alternately said storing means with the saiddistributor means to effect transmission of the character signalsinitiated; 1

6. A communication system of the character described comprising, incombination, means to initiate character signal impulses, distributormeans to impart the signals to a transmission line, groups of impulsestoring means comprising electrostatic devices and means controlled bythe initiating ,means to connect alternately the groups of said deviceswith the said initiating means and distributor. means.

7. A communication system of the character described comprising, incombination, means to initiate character signal impulses, distributormeans to' impart the signals we. transmission line, aplurality ofimpulse storing means, and means controlled by the initiating means tocon' nect certain of said storing means alternately with the saidinitiating means and distributor means.

8. A communication system of the character described comprising, incombination, means to .initiate character signal impulses. distributormeans to impart the signals successively to a transmission line, aplurality of impulse storing means comprising condensers, and meanscontrolled by the initiating means to connect certain of said condensersalternately and periodically with the said initiating means anddistributor means.

9. A communication system of the character described comprisin incombination, means to initiate character signal impulses, distributormeans to impart the signals successively to a transmission line, aplurality of impulse storage relays, and means controlled bytheinitiating means to connect certain of said relays altematelyandperiodically with the said initiating means and distributor means.

, CHARLES R. DOTY.

